From: Tomas Hruby <tom@minix3.org>
Date: Wed, 27 Jan 2010 09:34:47 +0000 (+0000)
Subject: No need to use memcpy to copy a message of 36 bytes. The overhead just
X-Git-Tag: v3.1.6~21
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=e0f7043e04839e55f5a294a15a4d69557892d14a;p=minix.git

No need to use memcpy to copy a message of 36 bytes. The overhead just
to call memcpy is half of the inline copy (using gcc -O)
---

diff --git a/kernel/system.c b/kernel/system.c
index 93ba522c0..a64980cb2 100644
--- a/kernel/system.c
+++ b/kernel/system.c
@@ -115,7 +115,7 @@ PUBLIC void sys_task()
 	 */
         vmassert(RTS_ISSET(caller_ptr, RTS_VMREQUEST));
 	vmassert(caller_ptr->p_vmrequest.type == VMSTYPE_KERNELCALL);
-	memcpy(&caller_ptr->p_vmrequest.saved.reqmsg, &m, sizeof(m));
+	caller_ptr->p_vmrequest.saved.reqmsg = m;
       } else if (result != EDONTREPLY) {
 	/* Send a reply, unless inhibited by a handler function.
 	 * Use the kernel function lock_send() to prevent a system
@@ -564,7 +564,7 @@ PRIVATE struct proc *vmrestart_check(message *m)
 
 	switch(type) {
 		case VMSTYPE_KERNELCALL:
-			memcpy(m, &restarting->p_vmrequest.saved.reqmsg, sizeof(*m));
+			*m = restarting->p_vmrequest.saved.reqmsg;
 			restarting->p_vmrequest.saved.reqmsg.m_source = NONE;
 			vmassert(m->m_source == restarting->p_endpoint);
 			/* Original caller could've disappeared in the meantime. */